CN110903096B - Calcium hexaluminate castable for plasma gasification furnace and preparation method thereof - Google Patents

Calcium hexaluminate castable for plasma gasification furnace and preparation method thereof Download PDF

Info

Publication number
CN110903096B
CN110903096B CN201911230038.7A CN201911230038A CN110903096B CN 110903096 B CN110903096 B CN 110903096B CN 201911230038 A CN201911230038 A CN 201911230038A CN 110903096 B CN110903096 B CN 110903096B
Authority
CN
China
Prior art keywords
calcium
calcium hexaluminate
castable
hexaluminate
alpha
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201911230038.7A
Other languages
Chinese (zh)
Other versions
CN110903096A (en
Inventor
顾华志
陈定
黄奥
张美杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan University of Science and Engineering WUSE
Original Assignee
Wuhan University of Science and Engineering WUSE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan University of Science and Engineering WUSE filed Critical Wuhan University of Science and Engineering WUSE
Priority to CN201911230038.7A priority Critical patent/CN110903096B/en
Publication of CN110903096A publication Critical patent/CN110903096A/en
Application granted granted Critical
Publication of CN110903096B publication Critical patent/CN110903096B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3232—Titanium oxides or titanates, e.g. rutile or anatase
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
    • C04B2235/447—Phosphates or phosphites, e.g. orthophosphate, hypophosphite

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Products (AREA)

Abstract

The invention provides aThe invention provides a calcium hexaluminate castable for a plasma gasification furnace and a preparation method thereof, wherein the preparation method comprises the following steps: weighing 70-80 wt% of calcium hexaluminate and 1-8 wt% of alpha-Al2O3Mixing the micro powder, 0.1-8 wt% of titanium dioxide and 10-20 wt% of calcium aluminate cement, adding a water reducing agent, and uniformly mixing to obtain a premix; adding water into the premix, and uniformly stirring to obtain a castable; and curing the castable at room temperature, demolding, drying and sintering at high temperature to obtain the calcium hexaluminate castable for the plasma gasification furnace. The calcium hexaluminate castable for the plasma gasifier has the characteristics of high-temperature strength, good thermal shock stability and strong high-temperature steam corrosion resistance.

Description

Calcium hexaluminate castable for plasma gasification furnace and preparation method thereof
Technical Field
The invention belongs to the technical field of casting materials, and particularly relates to a calcium hexaluminate casting material for a plasma gasifier and a preparation method thereof.
Background
The harmless disposal of special hazardous wastes with high toxicity and high risk becomes a troublesome problem to be solved urgently for the urban environment safety. The plasma technology ionizes air, and the temperature can reach 3000-10000 ℃ in thousandth of a second. High-risk wastes such as industrial wastes, electronic wastes, medical wastes and the like are subjected to plasma gasification treatment, the emission of common waste incineration products such as heavy metals, polycyclic aromatic hydrocarbons, dioxin and the like is extremely low, and the plasma gasification furnace can realize harmless treatment of the high-risk wastes. However, the lack of suitable refractory lining limits the use of plasma gasifiers. The chromium-containing material is commonly used in a plasma gasification furnace, but the chromium-containing material reacts with alkali under the condition of high-temperature oxidation atmosphere to generate the highly toxic Cr6+The compound is not only carcinogenic, but also can cause serious pollution to the environment, and the chromium-free compound is an important development direction of the lining material of the garbage incinerator.
A large amount of water vapor is generated in the process of treating the dangerous waste by the plasma gasification furnace, and the water vapor can seriously corrode refractory materials at high temperature. The plasma torch has strong heat radiation in the working process, the surface of the refractory material can generate high temperature quickly, great temperature gradient and thermal stress are caused, and strict requirements are provided for the thermal shock stability and high-temperature strength of the refractory material of the furnace lining.
Calcium hexaluminate (CaAl)12O19Abbreviated as CA6) Is A1 in the calcium aluminate system2O3The phase with the highest content is a refractory material with excellent performance developed in recent years, and the theoretical density of the refractory material reaches 3.38g/cm3The melting point is 1875 ℃, the chemical stability in alkaline environment is good, the main crystallization area is large, the solubility in several multi-component systems is low, and the wettability to molten metal and slag (steel and nonferrous metal) is low. In addition, its coefficient of thermal expansion is equal to A12O3Closely adjacent to the aluminum oxide, and can be mixed with the aluminum oxide in any proportion without causing cracks. These excellent characteristics make CA6Has wide application prospect in high temperature industry. In addition, CA6Unlike other aluminum calcium compounds, CA6Does not react with water, has stable high-temperature chemical property and strong corrosion resistance to oxidation and reduction gas, and has application prospect in lining materials of plasma gasification furnaces.
CA6The crystals are of lamellar structure, and sintering property among lamellar structures is poor, so that CA is adopted6The material as the main body is difficult to sinter and densify, and has low high-temperature strength. At present, no research report is provided for preparing the calcium hexaluminate castable with high density and excellent high-temperature mechanical property.
Disclosure of Invention
In view of the above, the invention provides a calcium hexaluminate castable for a plasma gasifier and a preparation method thereof, and the calcium hexaluminate castable for the plasma gasifier has the characteristics of high-temperature strength, good thermal shock stability and strong high-temperature steam corrosion resistance.
The invention provides a calcium hexaluminate castable for a plasma gasification furnace, which comprises the following raw materials in percentage by mass: 70-80% of calcium hexaluminate and alpha-Al2O31-8% of micro powder, 0.1-8% of titanium dioxide and 10-20% of calcium aluminate cement; the water reducing agent also comprises a water reducing agent and water, wherein the adding amount of the water reducing agent is calcium hexaluminate and alpha-Al2O3Micro powder, titanium dioxide and calcium aluminate water0.1-0.3% of the total mass of the mud; the addition amount of the water is calcium hexaluminate and alpha-Al2O33-9% of the total mass of the micro powder, the titanium dioxide and the calcium aluminate cement.
Further, the calcium hexaluminate castable for the plasma gasifier comprises the following raw materials in percentage by mass: 71.5% of calcium hexaluminate and alpha-Al2O31.5 percent of micro powder, 7.5 percent of titanium dioxide and 19.5 percent of calcium aluminate cement; the water reducing agent also comprises a water reducing agent and water, wherein the adding amount of the water reducing agent is calcium hexaluminate and alpha-Al2O30.2 percent of the total mass of the micro powder, the titanium pigment and the calcium aluminate cement; the addition amount of the water is calcium hexaluminate and alpha-Al2O36 percent of the total mass of the micro powder, the titanium pigment and the calcium aluminate cement.
Further, the calcium hexaluminate castable for the plasma gasifier comprises the following raw materials in percentage by mass: 78.5% of calcium hexaluminate and alpha-Al2O34.5% of micro powder, 2% of titanium dioxide and 15% of calcium aluminate cement; the water reducing agent also comprises a water reducing agent and water, wherein the adding amount of the water reducing agent is calcium hexaluminate and alpha-Al2O30.2 percent of the total mass of the micro powder, the titanium pigment and the calcium aluminate cement; the addition amount of the water is calcium hexaluminate and alpha-Al2O38 percent of the total mass of the micro powder, the titanium pigment and the calcium aluminate cement.
Further, Al of the calcium hexaluminate2O3The content is more than or equal to 88wt percent, and the particle density is more than or equal to 3.0g/cm3(ii) a The particle composition of the calcium hexaluminate is as follows:
the calcium hexaluminate with the particle size of less than 5mm and not less than 3mm accounts for 20-25 wt% of the total weight of the calcium hexaluminate,
the calcium hexaluminate with the grain diameter of less than 3mm and not less than 1mm accounts for 30-35 wt% of the total amount of the calcium hexaluminate,
the calcium hexaluminate with the grain diameter of less than 1mm and not less than 0.044mm accounts for 10-15 wt% of the total amount of the calcium hexaluminate,
the calcium hexaluminate with the particle size of less than or equal to 0.044mm accounts for 25-40 wt% of the total amount of the calcium hexaluminate.
Further, the water reducing agent is any one or a mixture of two of polyether, polycarboxylic acid, sodium tripolyphosphate, sodium tetrapolyphosphate and sodium hexametaphosphate.
Further, the alpha-Al2O3Micronized Al2O3The content is more than or equal to 99 wt%, and the alpha-Al2O3The particle size of the micro powder is less than or equal to 5 mu m.
Further, TiO of the titanium dioxide2The content is more than or equal to 97 wt%, and the particle size of the titanium dioxide is less than or equal to 0.088 mm.
Further, Al of the calcium aluminate cement2O3The content is more than or equal to 69.3 wt%, the CaO content is more than or equal to 29.6 wt%, and the median diameter of the calcium aluminate cement is less than or equal to 15 mu m.
The invention also provides a preparation method of the calcium hexaluminate castable for the plasma gasification furnace, which comprises the following steps:
step S1, weighing 70-80 wt% of calcium hexaluminate and 1-8 wt% of alpha-Al2O3Mixing the micro powder, 0.1-8 wt% of titanium dioxide and 10-20 wt% of calcium aluminate cement, adding a water reducing agent, and uniformly mixing to obtain a premix; the addition amount of the water reducing agent is calcium hexaluminate and alpha-Al2O30.1-0.3% of the total mass of the micro powder, the titanium dioxide and the calcium aluminate cement;
step S2, adding water into the premix prepared in the step S1, and uniformly stirring to obtain a castable; the added amount of water is calcium hexaluminate and alpha-Al2O33-9% of the total mass of the micro powder, the titanium dioxide and the calcium aluminate cement;
and S3, curing the castable obtained in the step S2 at room temperature for 24-30 hours, demolding, baking at 100-120 ℃ for 24-30 hours, and sintering at 1500-1650 ℃ to obtain the calcium hexaluminate castable for the plasma gasifier.
Compared with the prior art, the invention has the following beneficial effects:
CA6the high-temperature steam corrosion resistance is strong, the matrix contains 10-20 wt% of calcium aluminate cement as a binding agent, hydration products are formed after normal-temperature hydration, the castable has high normal-temperature strength, and in the high-temperature sintering process, the hydration products are dehydrated and are mixed with alpha-Al2O3The micro powder reacts to generate CA which is not easy to hydrate6The steam corrosion resistance of the castable is improved; the added titanium dioxide can react with CA6The calcium titanium aluminate solid solution is generated through reaction, sintering densification of the castable is promoted, and meanwhile, the calcium titanium aluminate solid solution as a high-temperature phase can remarkably improve the strength of the castable; the calcium hexaluminate castable for the plasma gasifier has the breaking strength of 20-35 MPa; the residual breaking strength after 5 times of thermal shock water cooling circulation at 1100 ℃ is 5-15 MPa, and the thermal state breaking strength at 1400 ℃ is 5-15 MPa.
Drawings
FIG. 1 is a process schematic diagram of a preparation method of a calcium hexaluminate castable for a plasma gasifier.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
The embodiment of the invention provides a calcium hexaluminate castable for a plasma gasification furnace, which comprises the following raw materials in percentage by mass: 70-80% of calcium hexaluminate and alpha-Al2O31-8% of micro powder, 0.1-8% of titanium dioxide and 10-20% of calcium aluminate cement; also comprises a water reducing agent and water, wherein the adding amount of the water reducing agent is calcium hexaluminate and alpha-Al2O30.1-0.3% of the total mass of the micro powder, the titanium dioxide and the calcium aluminate cement; the added amount of water is calcium hexaluminate and alpha-Al2O33-9% of the total mass of the micro powder, the titanium dioxide and the calcium aluminate cement.
Wherein, Al of calcium hexaluminate2O3The content is more than or equal to 88wt percent, and the particle density is more than or equal to 3.0g/cm3(ii) a The particle composition of the calcium hexaluminate is:
the calcium hexaluminate with the particle size of less than 5mm and not less than 3mm accounts for 20-25 wt% of the total weight of the calcium hexaluminate,
calcium hexaluminate having a particle size of less than 3mm and not less than 1mm accounts for 30 to 35wt% of the total amount of calcium hexaluminate, calcium hexaluminate having a particle size of less than 1mm and not less than 0.044mm accounts for 10 to 15wt% of the total amount of calcium hexaluminate,
the calcium hexaluminate with the particle size of less than or equal to 0.044mm accounts for 25-40 wt% of the total amount of the calcium hexaluminate.
The water reducing agent is any one or a mixture of two of polyether, polycarboxylic acid, sodium tripolyphosphate, sodium tetrapolyphosphate and sodium hexametaphosphate; alpha-Al2O3Micronized Al2O3Content is more than or equal to 99 wt%, alpha-Al2O3The particle size of the micro powder is less than or equal to 5 mu m; TiO of titanium dioxide2The content is more than or equal to 97 wt%, and the particle size of the titanium dioxide is less than or equal to 0.088 mm; al of calcium aluminate cement2O3The content is more than or equal to 69.3wt percent, the CaO content is more than or equal to 29.6wt percent, and the median diameter of the calcium aluminate cement is less than or equal to 15 mu m.
Referring to fig. 1, the invention also provides a preparation method of the calcium hexaluminate castable for the plasma gasifier, which comprises the following steps:
step S1, weighing 70-80 wt% of calcium hexaluminate and 1-8 wt% of alpha-Al2O3Mixing the micro powder, 0.1-8 wt% of titanium dioxide and 10-20 wt% of calcium aluminate cement, adding a water reducing agent, and uniformly mixing to obtain a premix; the addition amount of the water reducing agent is calcium hexaluminate and alpha-Al2O30.1-0.3% of the total mass of the micro powder, the titanium dioxide and the calcium aluminate cement;
step S2, adding water into the premix prepared in the step S1, and uniformly stirring to obtain a castable; the added amount of water is calcium hexaluminate and alpha-Al2O33-9% of the total mass of the micro powder, the titanium dioxide and the calcium aluminate cement;
and S3, curing the castable obtained in the step S2 at room temperature for 24-30 hours, demolding, baking at 100-120 ℃ for 24-30 hours, and sintering at 1500-1650 ℃ to obtain the calcium hexaluminate castable for the plasma gasifier.
The calcium hexaluminate castable for a plasma gasifier and the preparation method thereof according to the present invention will be described in detail with reference to the following examples.
Example 1:
715g of calcium hexaluminate and 15g of alpha-Al are weighed2O3Mixing the micro powder, 75g of titanium dioxide and 195g of calcium aluminate cement, adding 2g of polyether, and uniformly mixing to obtain a premix; to what is expectedAdding 60g of water into the mixed materials, and uniformly stirring to obtain a castable; and curing the castable at room temperature for 28 hours, then demolding, baking at 110 ℃ for 26 hours, and sintering at 1650 ℃ to obtain the calcium hexaluminate castable for the plasma gasification furnace.
The calcium hexaluminate castable for the plasma gasifier prepared in example 1 is detected as follows: the breaking strength is 32 MPa; the residual compressive strength after 5 thermal shock water cooling cycles at 1100 ℃ is 12MPa, and the thermal state rupture strength at 1400 ℃ is 13 MPa.
Example 2:
730g of calcium hexaluminate and 35g of alpha-Al are weighed2O3Mixing the micro powder, 50g of titanium dioxide and 185g of calcium aluminate cement, adding 2.5g of polycarboxylic acid, and uniformly mixing to obtain a premix; adding 50g of water into the premix, and uniformly stirring to obtain a castable; curing the castable at room temperature for 25 hours, then demolding, baking at 100 ℃ for 25 hours, and sintering at 1630 ℃ to obtain the calcium hexaluminate castable for the plasma gasifier.
The calcium hexaluminate castable for the plasma gasifier prepared in example 2 is detected as follows: the breaking strength is 30 MPa; the residual compressive strength after 5 thermal shock water cooling cycles at 1100 ℃ is 13.5MPa, and the thermal state rupture strength at 1400 ℃ is 12 MPa.
Example 3:
760g of calcium hexaluminate and 60g of alpha-Al are weighed2O3Mixing the micro powder, 70g of titanium dioxide and 110g of calcium aluminate cement, adding 1.5g of sodium tripolyphosphate, and uniformly mixing to obtain a premix; adding 55g of water into the premix, and uniformly stirring to obtain a castable; and curing the castable at room temperature for 27 hours, then demolding, baking at 100 ℃ for 25 hours, and sintering at 1600 ℃ to obtain the calcium hexaluminate castable for the plasma gasification furnace.
The calcium hexaluminate castable for the plasma gasifier prepared in example 3 is detected as follows: the breaking strength is 28 MPa; the residual compressive strength after 5 thermal shock water cooling cycles at 1100 ℃ is 12MPa, and the thermal state rupture strength at 1400 ℃ is 13 MPa.
Example 4:
780g of six are weighedCalcium aluminate, 75g alpha-Al2O3Mixing the micro powder, 15g of titanium dioxide and 130g of calcium aluminate cement, adding 2g of sodium tetrapolyphosphate, and uniformly mixing to obtain a premix; adding 70g of water into the premix, and uniformly stirring to obtain a castable; and curing the castable at room temperature for 28 hours, then demolding, baking at 110 ℃ for 30 hours, and sintering at 1550 ℃ to obtain the calcium hexaluminate castable for the plasma gasifier.
The calcium hexaluminate castable for the plasma gasifier prepared in example 4 is detected as follows: the breaking strength is 27 MPa; the residual compressive strength after 5 thermal shock water cooling cycles at 1100 ℃ is 12MPa, and the thermal state rupture strength at 1400 ℃ is 11 MPa.
Example 5:
770g of calcium hexaluminate and 50g of alpha-Al are weighed2O3Mixing the micro powder, 60g of titanium dioxide and 120g of calcium aluminate cement, adding 2g of sodium hexametaphosphate, and uniformly mixing to obtain a premix; adding 80g of water into the premix, and uniformly stirring to obtain a castable; and curing the castable at room temperature for 28 hours, then demolding, baking at 100 ℃ for 30 hours, and sintering at 1500 ℃ to obtain the calcium hexaluminate castable for the plasma gasifier.
The calcium hexaluminate castable for the plasma gasifier prepared in example 5 is detected as follows: the breaking strength is 26 MPa; the residual compressive strength after 5 thermal shock water cooling cycles at 1100 ℃ is 15MPa, and the thermal state rupture strength at 1400 ℃ is 9 MPa.
Example 6:
785g of calcium hexaluminate and 45g of alpha-Al are weighed2O3Mixing the micro powder, 20g of titanium dioxide and 150g of calcium aluminate cement, adding a mixture of 2g of polyether and polycarboxylic acid, and uniformly mixing to obtain a premix; adding 80g of water into the premix, and uniformly stirring to obtain a castable; and curing the castable at room temperature for 28 hours, then demolding, baking at 100 ℃ for 30 hours, and sintering at 1500 ℃ to obtain the calcium hexaluminate castable for the plasma gasifier.
The calcium hexaluminate castable for the plasma gasifier prepared in example 6 is detected as follows: the breaking strength is 35 MPa; the residual compressive strength after 5 thermal shock water cooling cycles at 1100 ℃ is 9MPa, and the thermal state rupture strength at 1400 ℃ is 15 MPa.
The calcium hexaluminate castable for the plasma gasifier prepared in the embodiments 1-6 of the invention has the characteristics of high-temperature strength, good thermal shock stability and strong high-temperature steam corrosion resistance.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (6)

1. A preparation method of a calcium hexaluminate castable for a plasma gasification furnace is characterized by comprising the following steps:
s1, weighing 70-80% of calcium hexaluminate and 1-8% of alpha-Al according to mass percentage2O3Mixing the micro powder, 0.1-8% of titanium dioxide and 10-20% of calcium aluminate cement, adding a water reducing agent, and uniformly mixing to obtain a premix; the addition amount of the water reducing agent is calcium hexaluminate and alpha-Al2O30.1-0.3% of the total mass of the micro powder, the titanium dioxide and the calcium aluminate cement; the addition amount of the water is calcium hexaluminate and alpha-Al2O33-9% of the total mass of the micro powder, the titanium dioxide and the calcium aluminate cement;
s2, adding water into the premix prepared in the step S1, and uniformly stirring to obtain a castable;
and S3, curing the castable obtained in the step S2 at room temperature, demolding, drying at the temperature of 100-120 ℃ for 24-30 hours, and sintering at the high temperature of 1500-1650 ℃ to obtain the calcium hexaluminate castable for the plasma gasification furnace.
2. The preparation method according to claim 1, wherein the water reducing agent is any one or a mixture of two of polyether, polycarboxylic acid, sodium tripolyphosphate, sodium tetrapolyphosphate and sodium hexametaphosphate.
3. The method according to claim 1, wherein the particle composition of the calcium hexaluminate is:
the calcium hexaluminate with the particle size of less than 5mm and not less than 3mm accounts for 20-25 wt% of the total amount of the calcium hexaluminate;
the calcium hexaluminate with the particle size of less than 3mm and not less than 1mm accounts for 30-35 wt% of the total amount of the calcium hexaluminate;
the calcium hexaluminate with the particle size of less than 1mm and not less than 0.044mm accounts for 10-15 wt% of the total amount of the calcium hexaluminate;
the calcium hexaluminate with the particle size less than 0.044mm accounts for 25-40 wt% of the total amount of the calcium hexaluminate.
4. The preparation method according to claim 3, characterized by comprising the following raw materials in percentage by mass: 71.5% of calcium hexaluminate and alpha-Al2O31.5 percent of micro powder, 7.5 percent of titanium dioxide and 19.5 percent of calcium aluminate cement; the water reducing agent also comprises a water reducing agent and water, wherein the adding amount of the water reducing agent is calcium hexaluminate and alpha-Al2O30.2 percent of the total mass of the micro powder, the titanium pigment and the calcium aluminate cement; the addition amount of the water is calcium hexaluminate and alpha-Al2O36 percent of the total mass of the micro powder, the titanium pigment and the calcium aluminate cement.
5. The preparation method according to claim 3, characterized by comprising the following raw materials in percentage by mass: 78.5% of calcium hexaluminate and alpha-Al2O34.5% of micro powder, 2% of titanium dioxide and 15% of calcium aluminate cement; the water reducing agent also comprises a water reducing agent and water, wherein the adding amount of the water reducing agent is calcium hexaluminate and alpha-Al2O30.2 percent of the total mass of the micro powder, the titanium pigment and the calcium aluminate cement; the addition amount of the water is calcium hexaluminate and alpha-Al2O38 percent of the total mass of the micro powder, the titanium pigment and the calcium aluminate cement.
6. A calcium hexaluminate castable material obtained by the preparation method according to any one of claims 1 to 5.
CN201911230038.7A 2019-12-04 2019-12-04 Calcium hexaluminate castable for plasma gasification furnace and preparation method thereof Active CN110903096B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911230038.7A CN110903096B (en) 2019-12-04 2019-12-04 Calcium hexaluminate castable for plasma gasification furnace and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911230038.7A CN110903096B (en) 2019-12-04 2019-12-04 Calcium hexaluminate castable for plasma gasification furnace and preparation method thereof

Publications (2)

Publication Number Publication Date
CN110903096A CN110903096A (en) 2020-03-24
CN110903096B true CN110903096B (en) 2022-03-11

Family

ID=69822319

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911230038.7A Active CN110903096B (en) 2019-12-04 2019-12-04 Calcium hexaluminate castable for plasma gasification furnace and preparation method thereof

Country Status (1)

Country Link
CN (1) CN110903096B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111892396A (en) * 2020-08-20 2020-11-06 无锡市天寅耐火材料有限公司 Calcium hexaluminate castable not sticky to aluminum

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104761264A (en) * 2014-06-13 2015-07-08 常州瑞复达高温新材料有限公司 Calcium aluminate based refractory castable and application thereof to casting production
CN105036774A (en) * 2015-08-04 2015-11-11 武汉科技大学 Calcium titanium-aluminate prefabricated part for vanadium smelting reverberatory furnace lining and preparation method thereof
CN106278320A (en) * 2016-08-19 2017-01-04 武汉科技大学 A kind of coal gasifier furnace lining and preparation method thereof
CN107500747A (en) * 2017-09-15 2017-12-22 武汉威林科技股份有限公司 A kind of fine and close calcium hexaluminate castable and preparation method thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9592548B2 (en) * 2013-01-29 2017-03-14 General Electric Company Calcium hexaluminate-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104761264A (en) * 2014-06-13 2015-07-08 常州瑞复达高温新材料有限公司 Calcium aluminate based refractory castable and application thereof to casting production
CN105036774A (en) * 2015-08-04 2015-11-11 武汉科技大学 Calcium titanium-aluminate prefabricated part for vanadium smelting reverberatory furnace lining and preparation method thereof
CN106278320A (en) * 2016-08-19 2017-01-04 武汉科技大学 A kind of coal gasifier furnace lining and preparation method thereof
CN107500747A (en) * 2017-09-15 2017-12-22 武汉威林科技股份有限公司 A kind of fine and close calcium hexaluminate castable and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"添加剂对合成CA6性能和显微结构的影响";朱浩辰 等;《耐火材料》;20180430;第52卷(第2期);1、试验，2、结果与分析，表1 *

Also Published As

Publication number Publication date
CN110903096A (en) 2020-03-24

Similar Documents

Publication Publication Date Title
CN101792322B (en) Environment-friendly aqueous long-life self-flowing repairing mix for converter and preparation method thereof
CN106966740B (en) Waste incinerator calcium hexaluminate/silicon carbide castable and preparation method thereof
CN108516845A (en) A kind of oxidation chromium composite spinelle brick and preparation method thereof
JP2021502941A (en) A method for producing a porous sintered magnesia, a batch for producing a crude ceramic (grobkeramisch) refractory product having a granulated product (Koernung) made of sintered magnesia, such a product, and a product. Method of manufacture, lining of industrial furnace (Zustellung), and industrial furnace
US20080175990A1 (en) Methods of use of calcium hexa aluminate refractory linings and/or chemical barriers in high alkali or alkaline environments
BRPI0608499B1 (en) internal refractory lining of carbonator
CN102452836A (en) Cement-free aluminum-magnesium castable for rapidly baking ladle
GB2262522A (en) Refractory composition
EP2307131B1 (en) Gasifier reactor internal coating
CN110903096B (en) Calcium hexaluminate castable for plasma gasification furnace and preparation method thereof
CN111807851A (en) Composite castable prepared from waste ceramic roller and waste shed plate
Ren et al. Enhanced alkali vapor attack resistance of bauxite-SiC refractories for the working lining of cement rotary kilns via incorporation of andalusite
CN106316430A (en) Synthetized forsterite castable and preparation method thereof
CN103159485A (en) Refractory fettling material
CN110128113B (en) Magnesium-aluminum-titanium brick and preparation method and application thereof
CN111548105A (en) Preparation method of long-life prefabricated member for solid hazardous waste incineration rotary kiln
CN113636830B (en) Self-flowing castable containing recycled corundum castable and preparation method thereof
KR101659437B1 (en) Ceramic block having improved heat resistance and fire resistance
CN110776325B (en) Zeolite modified cement combined chromium-containing corundum castable and preparation method thereof
RU2787859C1 (en) Method for preparing aluminum titanate fire-resistant material using industrial aluminum slag and titanium slag
CN111470875B (en) Refractory castable for molten pool part of garbage melting gasifier
KR20200054418A (en) Reusable magnesia-carbon refractories
CN114477975B (en) High-temperature refractory sealing cement and preparation method thereof
CN116874290A (en) Chromium corundum castable containing calcium hexaluminate for dangerous waste incineration device
Kurtuluş et al. FLY ASH BASED FOAM GEOPOLYMERS WITH IMPROVED DRYING SHRINKAGE PROPERTIES

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant